Harness cord arrangement for a Jacquard loom

ABSTRACT

A loom harness having upper and lower hardness board, a plurality of harness cords jointly guided for each pattern repetition in the passage holes of the upper harness board and individually guided in the second passage holes of the lower harness board, a row of an arrangement of the harness cords in the upper harness board being applied, in the weft direction, in an identical sequence in harness pattern repetitions in the lower harness board, and with harness cords, which are guided in a passage hole in the upper harness board, being crossed by at least one cord of the harness cord sections guided through an adjacent passage hole in the upper harness board.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a loom harness having upper and lowerharness boards which have passage holes arranged in a grid, a pluralityof harness cords which are jointly guided for each pattern repetition inthe passage holes of the upper harness board and individually in thepassage holes of the lower harness board, a plurality of snap hooks forconnecting the harness cords to the Jacquard device, and a plurality ofreturn motion elements and heddles which are, in each case, connected tothe harness cords, with a row of the arrangement of the harness cords inthe upper harness board being mapped in the identical sequence in theharness pattern repetitions in the lower harness board in the weftdirection.

2. Description of the Prior Art

A Jacquard loom consists in general of a Jacquard device, a loom harnessand a loom. The Jacquard device contains shed forming elements with alifter which is connected to the loom harness.

FIGS. 1 and 2 show a known embodiment of a loom harness and a Jacquarddevice. The loom harness is assembled from bottom to top or from top tobottom respectively and is thus divided into a lower part and an upperpart. The lower part comprises return motion elements and heddles. Theupper part comprises snap hooks, harness cords and an upper and lowerharness board with passage holes. The harness cords per pattern repeatare connected to the strap and are arranged together in a passage holein the upper harness board and individually in passage holes in thelower harness board. The harness cords can be designed as single ordouble cords which are in each case provided with a loop and are hung ininto the snap hook with this loop.

In the known loom harness all harness cords of a through-bore in theupper harness board are mapped completely identically in all patternrepeats in the lower harness board. The harness cords of the followingpassage bores in the upper harness boards are successively arranged inthe same manner. When all harness cords are arranged, then thesemutually cross hole-wise as is illustrated in FIG. 2. At the locationsdesignated with “X” in Fig., a pressure is exerted on the harness cordsand a strong friction is produced. This arrangement of the harness cordshas the disadvantages that during operation the harness cords oscillateand/or are highly stressed against one another and at the edge of thethrough-bore by the friction. Through this the lifetime and the workingspeed of the loom harness is restricted to a high degree.

The object of the invention is to improve a loom harness in such amanner that the named disadvantages are eliminated and a considerableincrease of the working speed of the loom is made possible.

SUMMARY OF THE INVENTION

The object of the invention is achieved by crossing through the sectionsof the harness cord, which are guided in a passage hole in the upperharness board, by at least one cord of the sections which are guidedthrough the adjacent bore in the upper harness board.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described in the following with reference to theaccompanying drawings.

The drawings show:

FIG. 1 a known embodiment of a loom harness,

FIG. 2 a view, directed toward the lower side of the upper harnessboard, of the embodiment in accordance with FIG. 1, from which the pathof the harness cords can be seen,

FIG. 3 a view of the connection of a Jacquard device and an embodimentof a loom harness in accordance with invention,

FIG. 4 an embodiment of a loom harness in accordance with the inventionwith four weaving repetition patterns and two harness cords which arearrange in the hindmost row,

FIG. 5 the embodiment of the loom harness in accordance with FIG. 4 witheight harness cords arranged,

FIG. 6 the embodiment of the loom harness in accordance with FIG. 4 withten harness cords arranged,

FIG. 7 the embodiment of the loom harness in accordance with FIG. 4 inwhich the harness cords of a row in the upper harness board are arrangedin all pattern repetitions of the lower harness board,

FIG. 8 a section along the line IIV—IIV in FIG. 7 and

FIG. 9 the embodiment of a loom harness in accordance with FIG. 3 inwhich the harness cords are arranged in the hindmost row of all patternrepetitions and in the outwardly lying pattern repetitions of the secondrow.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As it has already been discussed above, the upper part of a conventionalloom harness, which is shown in FIG. 1, contains a plurality of snaphooks 1 and harness cords 2 as well as an upper harness board 3 withpassage holes 4 and a lower harness board 5 with passage holes 6. Thearrangement of the hole rows in the upper and lower harness board isknown. A plurality of return motion elements (springs 2) and heddles 23(only one return motion elements and one heddles are shown in FIG. 1)are connected to harness cords 21, respectively.

As FIG. 3 shows, a snap hook 1 is provided for connection of a board 11of the Jacquard device 22 to the loom harness and is designed in asingle piece. The snap hook has a middle section 12 and two sectionswhich are designed as eyes 13 and which are elastically deformable inorder to be able to open the eyes. The connection location of the board11 to the upper eye of the snap hook forms the harness separation point.The harness cords 2 are designed as double cords with a loop 14 at oneend and two sections which are in each case connected to heddles of thelower part of the loom harness.

For a better understanding an embodiment of a loom harness in accordancewith the invention will be explained with reference to a step-wise buildup and with reference to FIGS. 4 to 9, with the harness cords beingarranged in rows from the rear left to right (weft direction; arrows Aand B respectively) and from back to front (warp direction; arrows C andD respectively) as seen from the standing position of the weaver.Reference is made to FIG. 4. The loom harness has four patternrepetitions I to IV. Only one harness cord 2 is arranged. For a betterunderstanding the sections of the harness cord will be designated in thefollowing in accordance with the pattern repetitions I to IV. Thesections I.1 and IV.1 of the double cord are led in common through theleft passage hole in the upper harness board 3 and in each caseindividually through the left passage holes of the outwardly lyingpattern repetitions I and IV in the lower harness board.

FIG. 5 shows the loom harness, in which the sections I.1 to I.4 and IV.1to IV.4 of the double cord are arranged in the outwardly lying patternrepetitions I and IV in the lower harness board 5. This arrangement isobtained in that in the upper hardness board 3 the double cords aresuccessively arranged in a sequence in the direction of the arrow Astarting from left to right. Through this arrangement the sections whichare arranged afterwards lie in each case in front of the previouslyarranged sections. As can be seen from FIG. 6 the sections II.1 andIII.1 of the double cord are arranged in the same sense for the inwardlylying pattern repetitions II and III. FIG. 7 shows the loom harness, inwhich the sections in the rear row of the pattern repetitions I to IVare arranged in such a manner that a row of the arrangement of theharness cords in the upper harness board 3 are mapped in the identicalsequence into the harness pattern repetitions in the lower harness board5 in the direction of the arrow A.

FIG. 8 shows a view corresponding to FIG. 2 of the path of the sectionsof the double cord in the above described embodiment of the loomharness. Through the successive arrangement the sections I.1 to I.4,II.1 to II.4, III.1 to III.4 and IV.1 to IV.4 of the double cord arearranged in a staggered manner so that the sections which are guided ina bore in the upper harness board cross at least one of the sectionswhich are guided through the adjacent passage hole 4 in the upperharness board 3. The staggered arrangement has the effect that the nameddisadvantages of the know loom harness are eliminated and has theadvantage that the sections are mutually guided.

FIG. 9 shows the loom harness in which the harness pattern repetitionsof the rear row and a harness cord of the row lying in front of it arearranged.

What is claimed is:
 1. A loom harness, comprising an upper harness board having first passage holes arranged in a grid; a lower harness board having second passage holes arranged in a grid; a plurality of harness cords jointly guided for each pattern repetition in the first passage holes of the upper harness board and individually guided in the second passage holes of the lower harness board; a plurality of snap hooks for connecting the harness cords to a Jacquard device; and a plurality of return motion elements and heddles connected with the harness cords, respectively, wherein a row of an arrangement of the harness cords in the upper harness board is mapped, in a weft direction, in an identical sequence in harness pattern repetitions in the lower harness board; wherein sections of the harness cords, which are guided in a passage hole in the upper harness board, are crossed by at least one cord of the harness cord sections guided through an adjacent passage hole in the upper harness board, and wherein the identical sequence of the arrangement of the harness cords in the upper harness board, is mapped, in the lower harness board, pattern-repetitionwise and in rows starting from respective outer pattern repetitions in a direction toward a center of the harness.
 2. A loom harness, comprising an upper harness board having first passage holes arranged in a grid; a lower harness board having second passage holes arranged in a grid; a plurality of harness cords jointly guided for each pattern repetition in the first passage holes of the upper harness board and individually guided in the second passage holes of the lower harness board; a plurality of snap hooks for connecting the harness cords to a Jacquard device; and a plurality of return motion elements and heddles connected with the harness cords, respectively, wherein a row of an arrangement of the harness cords in the upper harness board is mapped in the weft direction in an identical sequence in harness pattern repetitions in the lower harness board; wherein sections of the harness cords, which are guided in a passage are crossed by at least one cord of the harness cord sections guided through an adjacent passage hold in the upper harness board; and wherein the identical sequence of the arrangement of the harness cords in the upper harness board, in the lower harness board, is mapped pattern-repetitionwise and in rows starting from a center of the harness in a direction toward respective outer pattern repetitions.
 3. A loom harness according to claim 1, wherein mapping in the lower harness board takes place pairwise per a passage hole in the upper harness board.
 4. A loom harness according to claim 2, wherein the mapping in the lower harness board takes place pairwise per a passage hole in the upper harness board.
 5. A loom harness, comprising an upper harness board having first passage holes arranged in a grid; a lower harness board having second passage holes arranged in a grid; a plurality of harness cords jointly guided for each pattern repetition in the first passage holes of the upper harness board and individually guided in the second passage holes of the lower harness board; a plurality of snap hooks for connecting the harness cords to Jacquard device; and a plurality of return motion elements and heddles connected with the harness cords, respectively, wherein a row of an arrangement of the harness cords in the upper harness board is mapped in a weft direction in an identical sequence in harness pattern repetitions in the lower harness board; wherein sections of the harness cords, which are guided in a passage hole in the upper harness board, are crossed by at least one cord of the harness cord sections guided through an adjacent passage hole in the upper harness board, and wherein a snap hook is a single piece and has a middle section and two eye-shaped sections which lie with a free end in contact at the middle section of the snap hook and which are elastically deformable in order to be able to hang the snap hook into or out of a lifter and the harness cord into or out of the snap hook.
 6. A loom harness, comprising an upper harness board having first passage holes arranged in a grid; a lower harness board having second passage holes arranged in a grid; a plurality of harness cords jointly guided for each pattern repetition in the first passage holes of the upper harness board and individually guided in the second passage holes of the lower harness board; a plurality of snap hooks for connecting the harness cords to Jacquard device; and a plurality of return motion elements and heddles connected with the harness cords, respectively, wherein a row of an arrangement of the harness cords in the upper harness board is mapped in the weft direction in an identical sequence in harness pattern repetitions in the lower harness board; wherein the sections of the harness cords, which are guided in a passage hole in the upper harness board, are crossed by at least one cord of the harness cord sections guided through an adjacent passage hole in the upper harness board, and wherein the harness cord is a single piece provided with a loop at one end for hanging the harness cord into or out of the snap hook and having two sections for connecting the harness cord to the heddles.
 7. A loom harness, comprising an upper harness board having first passage holes arranged in a grid; a lower harness board having second passage holes arranged in a grid; a plurality of harness cords jointly guided for each pattern repetition in the first passage holes of the upper harness board and individually guided in the second passage holes of the lower harness board; a plurality of snap hooks for connecting the harness cords to Jacquard device; and a plurality of return motion elements and heddles connected with the harness cords, respectively, wherein a row of an arrangement of the harness cords in the upper harness board is mapped in a weft direction in an identical sequence in harness pattern repetition in the lower harness board; and at least one section of the harness cords, which are guided in passage holes in the upper harness board, is located between harness cords which are guided through an adjacent passage hold in the upper harness board.
 8. A loom, comprising a Jacquard device; and a harness connectable to the Jacquard device an including upper harness board having first passage holes arranged in a grid; a lower harness board having second passage holes arranged in a grid, a plurality of harness cords jointly guided for each pattern repetition in the first passage holes of the upper harness board and individually guided in the second passage holes of the lower harness board; a plurality of snap hooks for connecting the harness cords to the a Jacquard device; and a plurality of return motion elements and heddles connected with the harness cords, respectively, wherein a row of an arrangement of the harness cords in the upper harness board is mapped in a weft direction in an identical sequence in harness pattern repetition in the lower harness board; and at least one section of the harness cords, which are guided in passage holes in the upper harness board, is located between harness cords which are guided through an adjacent passage hold in the upper harness board. 